HD9 Studio Headphones (4-Pack) with HP4 Amplifier

The HD9/HP4 pack gives four people independent, high-quality monitoring from a single source, combining four closed-back reference headphones with a dedicated four-channel amplifier. Each HD9 headphone uses 45mm dynamic neodymium drivers in a circumaural, closed-back design tuned for a frequency response from 10Hz to 26kHz, so bass stays accurate and detail holds up even at higher volumes. High power handling of up to 1,800mW keeps the headphones clean under load, and two-axis 180-degree cup rotation along with a lightweight build make them comfortable to wear through a full session. A 10 foot single-sided cable with a gold-plated adapter and included storage bag round out each pair.

The HP4 amplifier drives all four headphones from one stereo source, with four screaming-loud outputs at 150mW per channel, independent level control and mono summing for each channel, and balanced 1/4 inch monitor outputs that can daisy-chain to additional amplifiers if the group grows. That makes this pack a direct fit for a podcast table, a band rehearsal, or any studio moment where several people need to hear the same mix at their own preferred volume without disturbing anyone else in the room.